Tractor with rear lamp

ABSTRACT

A purpose of the invention is to provide a tractor that includes a rear lamp with high designability. A tractor of the present invention includes a rear lamp, a cabin, a lamp housing that is provided along a longitudinal direction of a rear pillar of the cabin, and a light source that is housed in the lamp housing, wherein the rear lamp is provided from a vicinity of one end to a vicinity of the other end of the rear pillar in the longitudinal direction.

CROSS REFERENCE TO RELATED APPLICATIONS

This is the U.S. national stage of application No. PCT/JP2015/079496,filed on Oct. 20, 2015. Priority under 35 U.S.C. § 119(a) and 35 U.S.C.§ 365(b) is claimed from Japanese Application No. 2014-219720, filedOct. 28, 2014, the disclosure of which is also incorporated herein byreference.

TECHNICAL FIELD

The present invention relates to a tractor that includes a rear lamp.

BACKGROUND ART

Conventionally, there have been known work vehicles such as farmtractors (see Patent Document 1) and earthmoving wheel loaders. Suchwork vehicles generally include rear lamps. The rear lamps include taillamps, stop lamps, and turn signal lamps.

In view of the fact that the rear lamps must be disposed atpredetermined positions, normally the rear lamps of a work vehicle aremounted as separate members on the upper portions of the rear fenders,for example.

PRIOR ART DOCUMENT

Patent Document 1: JP-A 2010-163036

SUMMARY OF THE INVENTION Problems to be Solved by the Invention

However, in determining the disposition of the rear lamps, flexibilitytends to be limited with a work vehicle having large driving wheels, ofwhich the rear lamps must keep clear. Thus, in some cases, disposing therear lamps at the predetermined positions reduces designability as seenfrom the rear side of the work vehicle.

An object of the present invention is to provide a tractor that includesa rear lamp with high designability.

Solutions to the Problems

A tractor of the present invention includes a rear lamp, a cabin, a lamphousing that is provided along a longitudinal direction of a rear pillarof the cabin; and a light source that is housed in the lamp housing,wherein the rear lamp is provided from a vicinity of one end to avicinity of the other end of the rear pillar in the longitudinaldirection.

In the tractor, an outer surface of the rear pillar may be curvedoutward in a convex manner, and the lamp housing may be curved along theouter surface of the rear pillar.

In the tractor, the rear lamp may be hidden by the rear pillar as seenfrom an operator seat.

In the tractor, the light source may constitute a tail lamp, a stop lampand a turn signal lamp.

In the tractor, the rear lamp may include a lens that covers an openingof the lamp housing.

In the tractor, the rear lamp may include a light-transmissive lenscover that covers an outer surface of a lens.

In the tractor, the rear lamp may be provided with a rear reflector.

Effects of the Invention

In accordance with the work vehicle of the present invention, the rearlamp is provided along the longitudinal direction of the rear pillarpositioned behind the operator seat, resulting in high designability dueto an integrated appearance between the rear lamp and the rear pillar.

In accordance with the tractor of the present invention, the rear lampis provided from the vicinity of one end to the vicinity of the otherend of the rear pillar, thereby improving the integrated appearancebetween the rear lamp and the rear pillar and achieving highdesignability. Further, the rear lamp extends in the top-bottomdirection, resulting in excellent visibility. Still further, the rearlamp extends to the vicinity of a roof, resulting in short electricalwiring for the rear lamp through the roof.

The tractor of the present invention including the cabin provided withthe rear pillar is applicable to a tractor including a cabin.

In accordance with the tractor of the present invention, the outersurface of the rear pillar is curved outward in a convex manner and thelamp housing is curved along the outer surface of the rear pillar,resulting in high designability due to an integrated appearance betweenthe lamp housing and the rear pillar.

In accordance with the tractor of the present invention, the rear lampis hidden by the rear pillar as seen from the operator seat, therebypreventing light of the rear lamp from coming into sight of theoperator, which results in smooth operation.

In accordance with the tractor of the present invention, the lightsource constitutes a tail lamp, a stop lamp and a turn signal lamp,which allows the rear lamp to serve as a rear combination lamp.

In accordance with the tractor of the present invention, the rear lampincludes the lens covering the opening of the lamp housing, resulting indiffusion of light from the light source.

In accordance with the tractor of the present invention, the rear lampincludes the light-transmissive lens cover that covers an outer surfaceof the lens, thereby improving designability.

In accordance with the tractor of the present invention, the rear lampis provided with the work lamp, the work machine raise/lower switch orthe rear reflector, thereby reducing members separately mounted on therear portion of the work vehicle and improving designability.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exterior perspective view of a tractor.

FIG. 2 is a front view of the tractor.

FIG. 3 is a rear view of the tractor.

FIG. 4 is a right side view of the tractor.

FIG. 5 is a left side view of the tractor.

FIG. 6 is a plan view of the tractor.

FIG. 7 is an enlarged front view of a left rear lamp.

FIG. 8 is an enlarged rear view of the left rear lamp.

FIG. 9 is an enlarged right side view of the left rear lamp.

FIG. 10 is an enlarged left side view of the left rear lamp.

FIG. 11 is an enlarged plan view of the left rear lamp.

FIG. 12 is an enlarged bottom view of the left rear lamp.

FIG. 13 is an illustration corresponding to FIG. 8 from which a lens anda lens cover are removed.

FIG. 14 is an illustration corresponding to FIG. 9 from which the lensand the lens cover are removed.

FIG. 15 is an illustration corresponding to FIG. 10 from which the lensand the lens cover are removed.

FIG. 16 is an illustration corresponding to FIG. 11 from which the lensand the lens cover are removed.

FIG. 17 is an illustration explaining the positional relationshipbetween the left rear lamp and a left rear pillar.

EMBODIMENTS OF THE INVENTION

The technical idea of the present invention is applicable to any workvehicle such as an agricultural machinery vehicle or a constructionmachinery vehicle. In the following, a description will be given of atractor as a representative work vehicle. In the following, the front,rear, upper, lower, right, and left directions refer to those as seenfrom the operator seat (when the operator is seated).

FIG. 1 is a perspective view of a tractor. FIG. 2 is a front view of thetractor. FIG. 3 is a rear view of the tractor. FIG. 4 is a right sideview of the tractor. FIG. 5 is a left side view of the tractor. FIG. 6is a plan view of the tractor.

The tractor 1 includes a frame 11, an engine 12, a transmission 13, afront axle 14, and a rear axle 15.

The frame 11 forms the framework on the front side of the tractor 1. Theframe 11 constitutes, together with the transmission 13 and the rearaxle 15, the chassis of the tractor 1. The engine 12 described in thefollowing is supported by the frame 11.

The engine 12 converts thermal energy obtained by combustion of fuel tokinetic energy. That is, the engine 12 generates rotary power by burningfuel. Note that, an engine control apparatus is connected to the engine12 (not shown). In accordance with the operator's operating anacceleration pedal, the engine control apparatus changes the operationstate of the engine 12. Further, the engine 12 includes an exhaust gaspurification apparatus (not shown). The exhaust gas purificationapparatus oxidizes particulates, carbon monoxide, hydrocarbon and thelike contained in the exhaust gas.

The transmission 13 transmits the rotary power of the engine 12 to thefront axle 14 and the rear axle 15. The transmission 13 receives therotary power of the engine 12 through a coupling mechanism. Note that,the transmission 13 includes a continuously variable transmission (HMTor I-HMT). When the operator operates a gear shift lever, thecontinuously variable transmission changes the operating state of thetransmission 13 according to the operator's operation.

The front axle 14 transmits the rotary power of the engine 12 to fronttires 141. The front axle 14 receives the rotary power of the engine 12through the transmission 13. Note that, a steering apparatus (not shown)is juxtaposed to the front axle 14. When the operator operates asteering wheel, the steering apparatus changes the steering angle of thefront tires 141 according to the operator's operation.

The rear axle 15 transmits the rotary power of the engine 12 to reartires 151. The rear axle 15 receives the rotary power of the engine 12through the transmission 13. Note that, the rear axle 15 is providedwith a PTO output apparatus 152. When the operator operates a PTOswitch, the PTO output apparatus 152 transmits the rotary power to atowed work machine according to the operator's operation.

Further, the tractor 1 includes a cabin 16 that protects the operatorfrom wind and weather. The cabin 16 has pillars 161 to 164 that arerespectively disposed at the four corners, a roof 165 that issubstantially rectangular as seen in a plan view and supported by thepillars 161 to 164, and four window panes 166 to 169 respectivelyprovided between adjacent ones of the pillars 161 to 164. The inside ofthe cabin 16 is an operator's compartment where an operator seat 170 andthe like are disposed.

The pillars 161 to 164 consist of two front pillars 161, 162 and tworear pillars 163, 164. The front pillars 161, 162 consist of left frontpillar 161 and right front pillar 162, and the rear pillars 163, 164consist of left rear pillar 163 and right rear pillar 164. Note that,the number of the pillars is not limited.

As to the pillars 161 to 164, for example as shown in FIGS. 1 to 6, theleft front pillar 161 is curved left-frontward in a convex manner; theright front pillar 162 is curved right-frontward in a convex manner; theleft rear pillar 163 is curved left-rearward in a convex manner; and theright rear pillar 164 is curved right-rearward in a convex manner. Inthis manner, the pillars 161 to 164 may be curved outward in a convexmanner relative to the cabin 16. The condition being curved outward issatisfied by at least the outer surface (the surface positioned outsidethe vehicle) of the pillars 161 to 164 being curved in any outwarddirection. An inner surface (a surface positioned inside the vehicle) isnot necessarily curved outward.

The roof 165 is mounted on the upper ends of the pillars 161 to 164. Asshown in FIG. 6, in a plan view, the rear pillars 163, 164 are hidden bythe roof 165.

The window panes 166 to 169 consist of a front windshield 166, a rearwindshield 167, a left side window pane 168, and a right side windowpane 169. Note that, the window panes 166 to 169 are not specificallylimited so long as they are transparent plates capable of transmittingvisible light, and they may be made of a transparent resin material suchas polycarbonate. The left side window pane 168 and the right sidewindow pane 169 have their respective rear ends fixed to the left rearpillar 163 and the right rear pillar 164 with two hinges 171 each. Thus,the operator can open or close the left side window pane 168 and theright side window pane 169 gripping knobs 172 respectively provided atthe front ends of the left side window pane 168 and the right sidewindow pane 169.

The operator seat 170 is disposed at the center of the cabin 16 orslightly rearward relative to the center of the cabin 16. Around theoperator seat 170, the gear shift lever, the steering wheel, theacceleration pedal, a brake pedal, a clutch pedal, a reverser lever, aspeed dial, an instrument panel, a turn signal lamp lever, a lightswitch, a hazard switch, a work lamp switch and the like are disposed.The operator seated on the operator seat 170 can drive the tractor 1using the acceleration pedal and the like.

Further, the tractor 1 includes rear lamps 18, 19 respectively providedat the rear pillars 163, 164. The rear lamps 18, 19 consist of a leftrear lamp 18 provided at the left rear pillar 163 and a right rear lamp19 provided at the right rear pillar 164. As shown in FIG. 3, the leftrear lamp 18 and the right rear lamp 19 are laterally symmetricallyshaped and disposed. In order to avoid repetitive descriptions, in thefollowing, a description will be given mainly focusing on the left rearlamp 18, and a detailed description of the right rear lamp 19 will beomitted.

The left rear lamp 18 is provided along the longitudinal direction (thetop-bottom direction) of the left rear pillar 163. This presents anintegrated appearance between the left rear lamp 18 and the left rearpillar 163, and hence achieves high designability. In more detail, theleft rear lamp 18 is curved along the outer surface of the left rearpillar 163. This enhances the integrated appearance. Note that, so longas the left rear lamp 18 extends along the outer surface of the leftrear pillar 163, the left rear lamp 18 is not necessarily curvedidentically to the left rear pillar 163. For example, the left rear lamp18 may partially project.

Further, the left rear lamp 18 is closely in contact with the left rearpillar 163. This also enhances the integrated appearance. Alternatively,a clearance may be formed between the left rear lamp 18 and the leftrear pillar 163. For example, a clearance of a constant width may beformed between the left rear lamp 18 and the left rear pillar 163.

The left rear lamp 18 is provided from the vicinity of one end (upperend) to the vicinity of the other end (lower end) of the left rearpillar 163 in the longitudinal direction. That is, as seen from the rearside, the left rear pillar 163 is substantially covered with the leftrear lamp 18. This enhances the integrated appearance between the leftrear lamp 18 and the left rear pillar 163, and achieves highdesignability. Furthermore, the left rear lamp 18 being elongated in thetop-bottom direction provides excellent visibility. Still further, theleft rear lamp 18 extending to the vicinity of the roof 165 allows theelectrical wiring for the left rear lamp 18 to be arranged through theroof 165 thereby shortening the length of the electrical wiring.

Further, the length and position of the left rear lamp 18 are notlimited so long as the left rear lamp 18 extends along the outer surfaceof the left rear pillar 163. That is, the left rear lamp 18 is notnecessarily provided from the vicinity of one end to the vicinity of theother end of the left rear pillar 163 in the longitudinal direction. Forexample, the left rear lamp 18 may be provided from the vicinity of thecenter to the vicinity of the other end of the left rear pillar 163 inthe longitudinal direction. Conversely, the left rear lamp 18 may beprovided from substantial one end to the center of the left rear pillar163 in the longitudinal direction. Further, the left rear lamp 18 may beprovided just at the vicinity of the center of the left rear pillar 163in the longitudinal direction.

The left rear lamp 18 is formed so as to be hidden by the left rearpillar 163 as seen from the operator on the operator seat (when seated)170. Therefore, the left rear lamp 18 is designed to have a reducedthickness, and a width narrower than that of the left rear pillar 163.Since the left rear lamp 18 is hidden by the left rear pillar 163 asseen from the operator seated on the operator seat 170, light of theleft rear lamp 18 will not come within sight of the operator, therebyavoiding distracting the operator.

FIGS. 7 to 12 are enlarged views of the left rear lamp. FIGS. 7 to 11are illustrations seen from the directions identical to FIGS. 2 to 6,respectively. FIG. 12 is a bottom view. FIG. 13 is an illustrationcorresponding to FIG. 8 from which a lens and a lens cover are removed.FIG. 14 is an illustration corresponding to FIG. 9 from which the lensand the lens cover are removed. FIG. 15 is an illustration correspondingto FIG. 10 from which the lens and the lens cover are removed. FIG. 16is an illustration corresponding to FIG. 11 from which the lens and thelens cover are removed. FIG. 17 is an illustration explaining thepositional relationship between the left rear lamp and the left rearpillar.

The left rear lamp 18 includes a lamp housing 181, a light source 182, alens 183, and a lens cover 184.

The lamp housing 181 is a box-shaped member that has an opening on therear side surface, and formed by black-color resin, for example. Thelamp housing 181 has an attaching surface formed along the left rearpillar 163. In the present embodiment, the outer surface of the leftrear pillar 163 is curved outward in a convex manner, and the lamphousing 181 is curved along the outer surface of the left rear pillar163 from the vicinity of the upper end to the vicinity of the lower endof the left rear pillar 163 in the longitudinal direction. This presentsan integrated appearance between the lamp housing 181 and the left rearpillar 163, and achieves high designability.

Further, the lamp housing 181 is screwed to the left rear pillar 163using four holes 185. Note that, the lamp housing 181 may be attached byother means such as snaps. Inside the lamp housing 181, projections 186projecting rearward are formed respectively at the vicinity of the upperend and the vicinity of the lower end. The opposite surface sides of theprojections 186 are recesses 187, where the two hinges 171 of the leftside window pane 168 are partially housed (see FIG. 17). Between theprojections 186 inside the lamp housing 181, a recess 188 that housesthe light source 182 is formed. The recess 188 is provided with a hole(not shown) for screwing a substrate of the light source 182. Further,the recess 188 is provided with a reflective surface by aluminumdeposition or the like. Further, providing a partition inside the lamphousing 181 as appropriate can prevent light leakage from the lightsource 182. For example, a partition separating the recess 188 and theprojections 186 from each other can be provided.

Further, in the recess 188 of the lamp housing 181, a through hole 189for passing an electrical wiring for the light source 182 is formed. Thethrough hole 189 is disposed immediately above the light source 182, andpenetrates in the front-rear direction. The electrical wiring passesthrough the roof 165 and the left rear pillar 163, and connected to thelight source 182 through a hole provided at the position overlapping thethrough hole 189 of the left rear pillar 163 and the through hole 189.

The light source 182 is made up of one substrate and a plurality ofred-color LEDs and a plurality of orange-color LEDs mounted on thesubstrate. In the present embodiment, three LEDs are arranged in line inthe right-left direction to lead their respective columns. In eachcolumn, red-color LEDs are arranged by six pieces in the top-bottomdirection so that the columns form a red-color LED group 182 a. In eachcolumn, orange-color LEDs are arranged by eleven pieces in thetop-bottom direction so that the columns form an orange-color LED group182 b. The orange-color LED group 182 b is disposed above the red-colorLED group 182 a. The red-color LED group 182 a serves as a tail lamp anda stop lamp, and the orange-color LED group 182 b serves as a turnsignal lamp.

The light source 182 is housed in the recess 188 of the lamp housing181. As seen from the right and left side surfaces, the LED portion (thelight emitting part) projects further than the right and left sidesurfaces of the lamp housing 181. Thus, a greater amount of light can beextracted to the right and left sides, and visibility from the right andleft sides improves.

In this manner, employing LEDs as the light source 182 can reduce thethickness of the left rear lamp 18. The reduced thickness contributes torealizing the manner of the left rear lamp 18 being hidden by the leftrear pillar 163 as seen from the operator seat 170. Note that, any lightsource other than LEDs may be employed as the light source 182.

The rear lamp according to the present embodiment is a rear combinationlamp in which three types of lamps (the tail lamp, the stop lamp, andthe turn signal lamp) are installed. Alternatively, the rear lamp may beembodied as one type of lamp, or a combination of two or four or moretypes of lamps.

The lens 183 is a light diffusing member that covers the opening of thelamp housing 181. The lens 183 is just required to be alight-transmissive member, and for example may be made of transparentresin. The lens 183 covers the entire rear side surface of the lamphousing 181, and partially wraps the top, bottom, right, and left sidesurfaces. In particular, a portion of the lens 183 that overlaps theright side surface of the light source 182 extends so as to wrap theright side surface of the light source 182. The entire rear side surfaceof the lens 183 is faceted in a grid-like manner, and the top, bottom,right, and left side surfaces of the lens 183 are faceted in a slit-likemanner. Optimizing the shape or size of the facets, the substrate andthe like of the light source 182 become visually unobtrusive, and hencedesignability improves. Note that, the lens 183 is not limited to such ashape. The lens 183 is just required to be disposed at least on the rearside of the light source 182. For example, the lens may be provided justat a portion overlapping the light source 182.

Alternatively to the mode described above, a white-color light sourcemay be employed as the light source 182, and colored lens in red ororange may be employed as the lens 183.

The lens cover 184 is a light-transmissive member that covers the outersurface of the lens 183. The lens cover 184 may be made of transparentresin, for example. The lens cover 184 covers the entire rear sidesurface of the lens 183, and extends longer on part of the top, bottom,right, and left side surfaces of the lamp housing 181 than the lens 183does. The top, bottom, right, and left side surfaces of the lens cover184 are respectively flush with the top, bottom, right, and left sidesurfaces of the lamp housing 181, presenting an integrated appearancebetween the surfaces and the lamp housing 181 and achieving highdesignability. In order to be flush, the top, bottom, right, and leftside surfaces of the lamp housing 181 are provided with grooves forfitting to the lens cover 184.

Further, various components can be added in the space in the left rearlamp 18 excluding the light source 182. For example, a work lamp, a workmachine raise/lower switch, a rear reflector and the like may beprovided in the space.

The work lamp may be provided, for example, in the recess 188 of thelamp housing 181 and above the light source 182. The work machineraise/lower switch is normally provided at a rear portion of the rearfender, and includes a button for raising the coupled work machine and abutton for lowering the same. The work machine raise/lower switch may beprovided, for example, at the projections 186 beneath the light source182 of the lamp housing 181. In this case, the lens 183 and the lenscover 184 should have a length up to the lower end of the light source182, so as to avoid interference with the work machine raise/lowerswitch. The rear reflector may be provided, for example, at a positionin the rear side surface of the lens 183 or the lens cover 184 whereinterference with the light source 182 can be avoided. The rearreflector can be formed by subjecting the lens 183 or the lens cover 184to reflection works.

As described above, installing in the left rear lamp 18 the componentssuch as the work lamp, the work machine raise/lower switch, and the rearreflector which have conventionally been provided separately from therear lamp reduces members separately mounted on the rear side of thetractor 1, and improves designability.

While the cabin is provided in the above-described embodiment, thepresent invention is applicable to a work vehicle not including a cabin.For example, the present invention is also applicable to a work vehicleincluding a canopy or a roll bar. In this case also, the rear lamp isprovided to a rear pillar positioned behind the operator seat. Forexample, the rear lamp is provided to the rear pillar of the canopy orthe rear pillar of the roll bar. In this manner, the present inventionis applicable to a work vehicle that at least includes a rear pillarpositioned behind the operator seat. The shape or function of the rearpillar is not specifically limited. For example, the rear pillar may beinverted C-shaped. In this case, a laterally elongated rear lamp may beprovided along the horizontal portion of the rear pillar. Further, therear pillar may not be the rearmost pillar so long as it is positionedbehind the operator seat.

Further, the rear lamp may not be provided in a right and left pair, andthe rear lamp may be one in number. Still further, the right and leftrear lamps may be asymmetric.

INDUSTRIAL APPLICABILITY

The present invention is applicable to a work vehicle such as a farmtractor or an earthmoving wheel loader.

DESCRIPTION OF REFERENCE SIGNS

-   -   1: Tractor (work vehicle)    -   16: Cabin    -   18: Left rear lamp    -   19: Right rear lamp    -   163: Left rear pillar    -   164: Right rear pillar    -   170: Operator seat    -   181: Lamp housing    -   182: Light source    -   183: Lens    -   184: Lens cover

The invention claimed is:
 1. A tractor comprising: a rear lampcomprising a lamp housing and a light source that is housed in the lamphousing; and a cabin comprising a left front pillar, a right frontpillar, a left rear pillar, a right rear pillar, a roof which issupported by each of the pillars, a front windshield, a rear windshield,a left side window pane, and a right side window pane; and wherein: anouter surface of one of the right rear pillar or the left rear pillar iscurved outward in a convex manner; the lamp housing comprises a backsurface that defines one or more recesses configured to adjoin a rearportion of a hinge and the lamp housing is curved along the outersurface of the one of the right rear pillar or the left rear pillar; andthe back surface of the lamp housing is in contact with a rear surfaceof the one of the right rear pillar or the left rear pillar such thatthe lamp housing is provided from a vicinity of one end to a vicinity ofthe other end of the one of the right rear pillar or the left rearpillar in a longitudinal direction thereof.
 2. The tractor according toclaim 1, wherein: a width of the rear lamp is hidden by the one of theright rear pillar or the left rear pillar and the rear lamp is hidden bythe one of the right rear pillar or the left rear pillar when viewedfrom an operator seat; and the lamp housing substantially covers anentirety of the rear surface of the one of the right rear pillar or theleft rear pillar.
 3. The tractor according to claim 2, wherein: one ofthe left side window pane or the right side window pane corresponding tothe one of the left rear pillar or the right rear pillar has a rear endthereof fixed by two hinges to the one of the left rear pillar or theright rear pillar and is configured to be opened and closed by agripping knob provided at a front end of the one of the left side windowpane or the right side window pane, the two hinges comprising the hingeand another hinge; the lamp housing is formed with one or more recess ata vicinity of an upper end thereof and another recess at a vicinity of alower end thereof; and the two hinges of the one of the left side windowpane or the right side window pane are partially housed in the recessesof the lamp housing, respectively.
 4. The tractor according to claim 1,wherein: one of the left side window pane or the right side window panecorresponding to the one of the left rear pillar or the right rearpillar has a rear end thereof fixed by two hinges to the one of the leftrear pillar or the right rear pillar and is configured to be opened andclosed by a gripping knob provided at a front end of the one of the leftside window pane or the right side window pane, the two hingescomprising the hinge and another hinge; the lamp housing is formed withone or more recess at a vicinity of an upper end thereof and anotherrecess at a vicinity of a lower end thereof; and the two hinges of theside window pane are partially housed in the recesses of the lamphousing, respectively.
 5. The tractor according to claim 1, furthercomprising: a lens cover coupled to a front surface of the lamp housing;and a light source interposed between the front surface of the lamphousing and the lens cover; wherein: the lamp housing is formed with athrough hole for passing an electrical wiring for the light source; andthe electrical wiring passes through the roof and the one of the leftrear pillar or the right rear pillar and is connected to the lightsource through the through hole.
 6. The tractor according to claim 1,wherein: the lamp housing that is provided from a vicinity of one end toa vicinity of the other end of the one of the left rear pillar or theright rear pillar in a longitudinal direction thereof comprises the lamphousing provided from a vicinity of an upper end to a vicinity of alower end of the one of the left rear pillar or the right rear pillar ina longitudinal direction; the one of the left rear pillar or the rightrear pillar is provided so as to be covered by the rear lamp as seenfrom a rear of the tractor; one of the left side window pane or theright side window pane corresponding to the one of the left rear pillaror the right rear pillar has a rear end thereof fixed by two hinges tothe one of the left rear pillar or the right rear pillar, the two hingescomprising the hinge and another hinge; the lamp housing is formed withone or more recess at a vicinity of an upper end thereof and anotherrecess at a vicinity of a lower end thereof; and the two hinges of theside window pane are configured to be partially housed in the recessesof the lamp housing, respectively.
 7. The tractor according to claim 6,wherein: the lamp housing is formed with a through hole for passing anelectrical wiring for the light source; and the electrical wiring passesthrough the roof and the one of the left rear pillar or the right rearpillar and is connected to the light source through the through hole. 8.A tractor comprising: a pair of left and right front pillars; a pair ofleft and right rear pillars; and a rear lamp in contact with one rearpillar of the pair of left and right rear pillars, the rear lampcomprising: a lamp housing that extends vertically from a first end ofthe rear pillar of the pair of left and right rear pillars to a secondend of the rear pillar and is curved along an outer surface of one ofthe rear pillar; where the lamp housing defines a first recess at thefirst end and a second recess at the second end, at least one of thefirst recess and the second recess configured to adjoin a rear portionof at least one hinge; and a light source that is housed in the lamphousing; and wherein: each rear pillar of the pair of left and rightrear pillars has a rear surface; and the lamp housing is in contact withthe rear surface of the rear pillar that the rear lamp is in contactwith.
 9. The tractor of claim 8, wherein: the pair of left and rightfront pillars and the pair of left and right rear pillars are configuredto be connected by a plurality of window panes to define a cabinenclosed by the plurality of window panes; and the rear lamp is disposedoutside of the cabin.
 10. The tractor of claim 8, wherein the lamphosing is curved in a horizontal manner from a first side of the rearpillar to a second side of the rear pillar.
 11. The tractor according toclaim 8, wherein the light source comprises a tail lamp, a stop lamp anda turn signal lamp.
 12. The tractor according to claim 8, furthercomprising: a rear windshield is positioned between the pair of left andright rear pillars.
 13. The tractor according to claim 8, furthercomprising: a left side window pane comprising: a rear end coupled tothe left rear pillar; and a front end coupled to a left gripping knobconfigured to open and close the left side window pane; and a right sidewindow pane comprising: a rear end coupled to the right rear pillar; anda front end coupled to a right gripping knob configured to open andclose the right side window pane.
 14. The tractor according to claim 8,wherein: the lamp housing further comprises a through hole configured toallow an electrical wire to pass through the lamp housing to be coupledto the light source.
 15. A rear lamp for a tractor, the rear lampcomprising: a convexly curved lamp housing having a front side and aback side, the back side of the convexly curved lamp housing configuredto be coupled vertically along a rear surface of a rear pillar from afirst end to a second end, the rear pillar defining a cabin of thetractor; wherein: the front side of the convexly curved lamp housingdefines a channel configured to receive a light source that operates asa tail lamp, a stop lamp and a turn signal lamp; and the back side ofthe convexly curved lamp housing defines one or more recesses configuredto adjoin a rear portion of a hinge that is coupled to a side surface ofthe rear pillar; and the back side of the convexly curved lamp housingconfigured to contact the rear surface of the rear pillar while theconvexly curved lamp housing is coupled to the rear pillar.
 16. The rearlamp of claim 15, wherein: the rear lamp defines a through hole at theback side of the convexly curved lamp housing, the through holeconfigured to allow an electrical wire to pass through the convexlycurved lamp housing to be coupled to a light source of the rear lamp;and the electrical wire is configured to pass through a roof of atractor and a rear pillar of the tractor to be coupled to the lightsource.
 17. The rear lamp of claim 16, wherein the rear lamp furtherincludes a lens that covers the channel of the convexly curved lamphousing.
 18. The rear lamp of claim 17, wherein the rear lamp furtherincludes a light-transmissive lens cover that covers an outer surface ofthe lens.